Which question is important to assess contraindications before eyelash tinting?

Assessing contraindications before eyelash tinting is crucial for ensuring the safety and well-being of the client. The question regarding whether the client has glaucoma is particularly important because glaucoma is an eye condition that affects the pressure in the eye and can be exacerbated by certain chemicals used in eyelash tinting products. If a client has glaucoma, the use of dyes or tints might lead to irritation, allergic reactions, or other complications that could worsen their condition.

In this context, while the other options may provide useful information about the client's lash habits or previous experiences, they do not directly relate to the potential risks associated with underlying medical conditions that could affect the eye. Therefore, understanding a client's history concerning glaucoma allows the aesthetician to make informed decisions and ensure safe practices during the eyelash tinting procedure.